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Network Heresy

Tales of the network reformation

Last Build Date: Fri, 23 Feb 2018 09:04:19 +0000


Scaling Congressslowe

Thu, 12 Mar 2015 14:20:40 +0000

(This post was written by Tim Hinrichs, Shawn Hargan, and Alex Yip.) Policy is a topic that we’ve touched on before here at Network Heresy. In fact, policy was the focus of a series of blog posts: first describing the policy problem and why policy is so important, then describing the range of potential solutions, […]

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OVN, Bringing Native Virtual Networking to OVSjustindpettit

Tue, 13 Jan 2015 19:27:37 +0000

By Justin Pettit, Ben Pfaff, Chris Wright, and Madhu Venugopal Today we are excited to announce Open Virtual Network (OVN), a new project that brings virtual networking to the OVS user community. OVN complements the existing capabilities of OVS to add native support for virtual network abstractions, such as virtual L2 and L3 overlays and […]

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On Policy in the Data Center: Congressslowe

Fri, 12 Dec 2014 17:41:22 +0000

By Tim Hinrichs and Scott Lowe with contributions from Alex Yip, Dmitri Kalintsev, and Peter Balland (Note: this post is also cross-published at, a new site focused on policy.) In the first few parts of this series, we discussed the policy problem, we outlined dimensions of the solution space, and we gave a brief […]

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Accelerating Open vSwitch to “Ludicrous Speed”justindpettitdataplaneopenstack

Thu, 13 Nov 2014 01:11:09 +0000

[This post was written by OVS core contributors Justin Pettit, Ben Pfaff, and Ethan Jackson.] The overhead associated with vSwitches has been a hotly debated topic in the networking community. In this blog post, we show how recent changes to OVS have elevated its performance to be on par with the native Linux bridge. Furthermore, […]

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On Policy in the Data Center: Comparing OpenStack policy effortsslowe

Wed, 17 Sep 2014 20:36:22 +0000

(This post was written by Tim Hinrichs and Scott Lowe, with contributions from Pierre Ettori, Aaron Rosen, and Peter Balland.) In the first two parts of this blog series we discussed the problem of policy in the data center and the features that differentiate solutions to that problem. In this post, we give a high-level […]

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Geneve – Ecosystem Support Has ArriveddrbrucedGeneve-idf

Mon, 08 Sep 2014 17:21:31 +0000

[This post was authored by T. Sridhar and Jesse Gross.] Earlier this year, VMware, Microsoft, Red Hat and Intel published an IETF draft on Generic Network Virtualization Encapsulation (Geneve). This draft (first published on Valentine’s Day no less) includes authors from the each of the first generation encapsulation protocols — VXLAN, NVGRE, and STT. However, […]

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Physical Networks in the Virtualized Networking Worlddrbruceddlr

Fri, 11 Jul 2014 14:54:07 +0000

[This post was co-authored by Bruce Davie and Ken Duda] Almost a year ago, we wrote a first post about our efforts to build virtual networks that span both virtual and physical resources. As we’ve moved beyond the first proofs of concept to customer trials for our combined solution, this post serves to provide an update […]

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On Policy in the Data Center: The solution spaceslowe

Thu, 19 Jun 2014 08:00:51 +0000

(This post was written by Tim Hinrichs and Scott Lowe with contributions from Martin Casado, Peter Balland, Pierre Ettori, and Dennis Moreau.) In the first part of this series we described the policy problem: ensuring that the data center obeys the real-world rules and regulations that are pertinent to that data center. In this post, […]

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Elephant Detection in the vSwitch With Performance Handling in the Underlaynetworkheresy

Fri, 16 May 2014 20:32:14 +0000

As we’ve discussed previously, the vSwitch is a great position to detect elephant, or heavy-hitter flows because it has proximity to the guest OS and can use that position to gather additional context. This context may include the TSO send buffer, or even the guest TCP send buffer. Once an elephant is detected, it can […]

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On Policy in the Data Center: The policy problemnetworkheresy

Tue, 22 Apr 2014 00:53:09 +0000

(This post was written by Tim Hinrichs and Scott Lowe with contributions from Martin Casado, Mike Dvorkin, Peter Balland, Pierre Ettori, and Dennis Moreau.) Fully automated IT provisioning and management is considered by many to be the ultimate nirvana— people log into a self-service portal, ask for resources (compute, networking, storage, and others), and within […]

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